linux-kernel - Re: [PATCH 3/4] mtd: spinand: Add M70A series Micron SPI NAND devices

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Date:   Mon, 20 Jan 2020 11:16:26 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     shiva.linuxworks@...il.com
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Shivamurthy Shastri <sshivamurthy@...ron.com>
Subject: Re: [PATCH 3/4] mtd: spinand: Add M70A series Micron SPI NAND
 devices

Hi Shiva,

This is remark common to the four patches: you miss the 'v2' prefix in
the object.

shiva.linuxworks@...il.com wrote on Sun, 19 Jan 2020 15:54:31 +0100:

> From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> 
> Add device table for M70A series Micron SPI NAND devices.
> 
> While at it, disable the Continuous Read feature which is enabled by
> default.

Can you please give us more detail on why this is an issue?

Shall we backport it to stable?

As a rule of thumb, when you start a sentence by "while at it" in a
commit message and this is not a trivial change : split the patch,
please. Unless this is really related and in this case explain how and
why in the commit message.

> 
> Signed-off-by: Shivamurthy Shastri <sshivamurthy@...ron.com>
> ---
>  drivers/mtd/nand/spi/micron.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
> index 5fd1f921ef12..45fc37c58f8a 100644
> --- a/drivers/mtd/nand/spi/micron.c
> +++ b/drivers/mtd/nand/spi/micron.c
> @@ -131,6 +131,26 @@ static const struct spinand_info micron_spinand_table[] = {
>  		     0,
>  		     SPINAND_ECCINFO(&micron_8_ooblayout,
>  				     micron_8_ecc_get_status)),
> +	/* M70A 4Gb 3.3V */
> +	SPINAND_INFO("MT29F4G01ABAFD", 0x34,
> +		     NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     0,
> +		     SPINAND_ECCINFO(&micron_8_ooblayout,
> +				     micron_8_ecc_get_status)),
> +	/* M70A 4Gb 1.8V */
> +	SPINAND_INFO("MT29F4G01ABBFD", 0x35,
> +		     NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     0,
> +		     SPINAND_ECCINFO(&micron_8_ooblayout,
> +				     micron_8_ecc_get_status)),
>  };
>  
>  static int micron_spinand_detect(struct spinand_device *spinand)
> @@ -153,8 +173,19 @@ static int micron_spinand_detect(struct spinand_device *spinand)
>  	return 1;
>  }
>  
> +static int micron_spinand_init(struct spinand_device *spinand)
> +{
> +	/*
> +	 * M70A device series enable Continuous Read feature at Power-up,
> +	 * which is not supported. Disable this bit to avoid any possible
> +	 * failure.
> +	 */
> +	return spinand_upd_cfg(spinand, CFG_QUAD_ENABLE, 0);
> +}
> +
>  static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
>  	.detect = micron_spinand_detect,
> +	.init = micron_spinand_init,
>  };
>  
>  const struct spinand_manufacturer micron_spinand_manufacturer = {

Thanks,
Miquèl